Fan fastener

ABSTRACT

A fastening system is provided with a wall ring as fastening device, a ventilator and a holding means, wherein the fastening device is provided in radial direction around the ventilator and the ventilator is connected to the fastening device via the holding means. The fastening device encompasses a first fastening geometry. The fastening system comprises the fastening device and additionally encompasses a holding device, wherein the fastening device encompasses at least one further, second fastening geometry for fastening the holding device to the fastening device. The fastening device and thus the wall ring axial ventilator can be fastened in a common manner to a unit via the first fastening geometry. The second fastening geometry serves to fasten the holding device to the fastening device, so that the wall ring axial ventilator can be fastened to a different design of a unit than a lamella heat exchanger.

The invention relates to a fastening device for a fan, in particular a wall ring axial ventilator.

A widespread application for fans is the use as cooling device at exhaust heat-producing units. Such exhaust heat-producing units can be heat exchangers, for example, wherein the fan is fastened directly to the heat exchanger or to a housing, which accommodates the heat exchanger. Fans for such applications can encompass a wall ring, via which the fastening is carried out. For this purpose, provision is made for boreholes and partial threaded holes at the front side of the wall ring. This type of fastening is widespread, for example in the case of the lamella heat exchangers, which are currently used for the most part.

For cost reasons, however, other designs of heat exchangers, which do not allow for a direct attaching of a fan above the wall ring, are also appearing on the market to an increasing extent. Known solutions for this problem, in the case of which the fastening of the drive motor of the ventilator takes place via a U-bracket with the bottom plate of a unit while foregoing a wall ring, have disadvantages with regard to efficiency and noise development.

It is thus the task of the invention to specify a fastening device for a wall ring axial ventilator, which can be used in applications, in which the fan is to be fastened to a different design than a lamella heat exchanger while maintaining the wall ring. In particular, this fastening option is to be possible optionally, so that the conventional fastening of the wall ring axial ventilator is still possible without restrictions.

According to the invention, this task is solved by means of a fastening system comprising the features of independent claim 1. Advantageous further developments of the fastening system follow from the subclaims 2-14.

A fastening system according to the invention is provided for fastening a wall ring axial ventilator to a unit. The fastening system is provided with a wall ring as fastening device, a ventilator and a holding means, wherein the fastening device is provided in radial direction around the ventilator and the ventilator is connected to the fastening device via the holding means. The fastening device encompasses a first fastening geometry. The fastening system comprises the fastening device and additionally encompasses a holding device, wherein the fastening device encompasses at least one further, second fastening geometry for fastening the holding device to the fastening device. The fastening device and thus the wall ring axial ventilator can be fastened in a common manner to a unit via the first fastening geometry. For example, the first fastening geometry consists of boreholes in a flange of the fastening device, so that the wall ring axial ventilator can be installed in a ring-shaped opening, such as the wall of a heat exchanger or of a heat exchanger housing and can be fastened by means of a fastening means, for example a screw. The second fastening geometry serves to fasten the holding device on the fastening device, so that the wall ring axial ventilator can be fastened to a different design of a unit than a lamella heat exchanger, for example to a bottom plate of a heat exchanger unit, via the holding device. The same wall ring axial ventilator can be adapted to customer-specific installation situations, such as, for example, different installation heights or different fastening positions, by using different holding devices, without changing the underlying wall ring axial ventilator itself.

In a preferred embodiment, the second fastening geometry is provided at the circumference of the fastening device. In a particularly preferred embodiment, the fastening device encompasses a collar at its circumference, wherein the second fastening geometry is provided at the circumference of the collar. The second fastening geometry can encompass a first guide, into which the holding device can be inserted, wherein the outer diameter of the first guide has maximally the same size as the maximum outer diameter of the fastening device. An assembly into a ring-shaped opening is thus possible without any problems in spite of the additional first guide. The first guide can be embodied as a dovetail guide, for example, and can encompass a trapezoidal shape or a cylindrical shape, for example.

It turned out to be advantageous, if the holding device encompasses at least a second guide, with which the first guide of the second fastening geometry can be operatively connected. For example, the holding device can be inserted with its second guide into the first guide of the fastening device. Advantageously, the guides of the second fastening geometry and of the holding device encompass corresponding bevels in axial direction. The two parts can thus be joined easily and still sit without play in the end position. In addition, the bevels can serve as mold release bevels, if the parts are cast. For example, the fastening device as well as the holding device can be made of a plastic, for example a thermoplastic or also a duroplastic plastic. The injection molding process, in the case of which bevels are advantageous for the demolding in demolding direction at the injection molding parts, lends itself for this.

In a further advantageous embodiment, the fastening device encompasses at least a first indexing means, wherein the holding device encompasses a second indexing means, which interacts with the first indexing means in response to the assembly of holding device with the fastening device. For example, the first indexing means can encompass an axial projection at the outer geometry of the collar of the fastening device, while the second indexing means encompasses a groove, which runs in axial direction, at the inner diameter of the holding device. The first indexing means can thus consist of the extension of at least one holding means, for example, which projects beyond the outer diameter of the collar. The second indexing means can initially be inserted into the first indexing means, before the guides engage. By inserting the indexing means, the guides can find one another more easily and the assembly is simplified.

In a further advantageous embodiment, the fastening device encompasses a first fixing geometry and the holding device encompasses a second fixing geometry, wherein the fixing geometries can be operatively connected in the assembled state. For example, the first fixing geometry is the first fastening geometry, wherein the second fixing geometry is a borehole in the holding device. For example, the first fixing geometry can be a borehole, which runs in axial direction, in a flange, which is provided at the fastening device, while the second fixing geometry encompasses a borehole or a stud hole in the holding device. If the two boreholes are aligned in the assembled state of the holding device, a fixing means, for example, can connect the two fixing geometries. A screw, for example, can serve as fixing means, wherein the screw is screwed through the first fixing geometry into the second fixing geometry, whereby the holding device is fixed to the fastening device. Other fixing means, such as anchor bolts or the like, are also possible. In the alternative, the fastening geometry can encompass a flange, which acts as first fixing geometry, for example, and the second fixing geometry can encompass a snap-fit at the holding device, wherein the snap-fit can snap in place downstream from the flange, when the holding device is assembled at the fastening device.

Further advantages, special features and advantageous further developments of the invention follow from the subclaims and from the illustration below of preferred exemplary embodiments by means of the illustrations.

Of the illustrations,

FIG. 1 shows a wall ring axial ventilator in conventional design in a three-dimensional illustration

FIG. 2 shows a wall ring axial ventilator comprising a fastening system according to the invention in a top view

FIG. 3 shows a wall ring axial ventilator comprising a fastening system according to the invention in a side view

FIG. 4 shows a section from a fastening device of a fastening system according to the invention in a three-dimensional illustration

FIG. 5 shows a holding device of a fastening system according to the invention in a three-dimensional illustration from a first perspective

FIG. 6 shows a holding device of a fastening system according to the invention in a three-dimensional illustration from a second perspective

FIG. 7 shows a section from an embodiment of a fastening system according to the invention in a three-dimensional illustration

FIG. 1 shows a wall ring axial ventilator in a conventional design in a three-dimensional illustration. The ventilator 140 is held via holding means 111 in a wall ring, which serves as fastening device 110. The fastening device 110 encompasses a collar 112 and a flange 119. Provision is made in the flange 119 for first fastening geometries 115 in the form of boreholes. The wall ring axial ventilator can be inserted into a ring-shaped section of a heat exchanger wall, for example, and can be connected to the heat exchanger wall, for example by means of screws, which are inserted through the first fastening geometries 115 and which are screwed into the heat exchanger wall.

FIG. 2 shows a wall ring axial ventilator comprising a fastening system 100 according to the invention in a top view. As in the case of a wall ring axial ventilator according to the state of the art, the ventilator 140 is held via holding means 111 in a wall ring, which serves as fastening device 110. The fastening device 110 encompasses a collar 112 and a flange 119. Provision is made in the flange 119 for first fastening geometries 115 in the form of boreholes. The wall ring axial ventilator can be inserted into a ring-shaped section of a heat exchanger wall, for example, and can be connected to the heat exchanger wall, for example by means of screws, which are inserted through the first fastening geometries 115 and which are screwed into the heat exchanger wall. In addition, the fastening system 100 encompasses a holding device 120, which is embodied as angle bracket and with the help of which the wall ring axial ventilator can be fastened to a bottom plate of a heat exchanger unit, for example. By using different holding devices 120, the wall ring axial ventilator can be adapted to customer-specific installation situations, such as, for example, different installation heights or different fastening positions, without changing the underlying wall ring axial ventilator itself. The holding device 120 encompasses two grooves as second indexing means 122, wherein the fastening device 110 encompasses first indexing means 113. These first indexing means 113 consist of the extension of the holding means 111, which project beyond the outer diameter of the collar 112. The grooves as second indexing means 122 can initially be inserted into the first indexing means 113. The fastening device 110 furthermore encompasses two first guides 117 in the form of dovetail guides, into which the corresponding second guides 121 are inserted at the holding device 120 in the assembled state. Before the guides 117, 121 engage, the indexing means 113, 122 are engaged, whereby the guides 117, 121 find one another more easily and the assembly is simplified. The fits of the indexing means 113, 122 thereby encompass more play than those of the guides 117, 121. The guides 117, 121 encompass bevels in axial direction, whereby they can be assembled easily and are nonetheless operatively connected to one another in their end position without play after assembly has taken place.

FIG. 3 shows a wall ring axial ventilator comprising the fastening system according to the invention in a side view. Holding device 120 and fastening device 110 are assembled to one another and are fixed to one another in this position via a screw 150, which is screwed into a stud hole in the holding device 120 as second fixing geometry 125 through a borehole in the fastening device 110 as first fixing geometry.

FIG. 4 shows a section from a fastening device of a fastening system 100 according to the invention in a three-dimensional illustration. In this illustration, two second fastening geometries 116 can be seen well. They consists in each case of an axial undercut, onto which the holding device 120 can be slid and thus fastened. The second fastening geometries 116 in each case encompass a dovetail guide as first guide 117. In this illustration, the flange 119 of the fastening device 110 can also be seen. A first fastening geometry 115 in the form of a through hole is located in the flange 119. This borehole simultaneously serves as first fixing geometry 118. In other words, the borehole is the first fastening geometry 115 in the case that the wall ring axial ventilator is installed into a ring-shaped section of a wall in a conventional manner. In this case, the wall ring axial ventilator can be fastened in the ring-shaped section by means of a screw, which is guided through this borehole and which is screwed into the wall. In the case, however, that the wall ring axial ventilator is fastened to the bottom plate of a heat exchanger unit, for example, the same borehole serves as first fixing geometry 118, wherein it can be inserted through a screw 150, which can be screwed in place in the second fixing geometry 125 of the holding device 120 (not shown in the figure), when the holding device 120 is assembled, so as to fix the holding device 120 to the fastening device 110.

FIG. 5 shows a holding device 120 of a fastening system 100 according to the invention in a three-dimensional illustration from a first perspective. The holding device 120 forms a segment of a circle. Two second guides 121 in the form of counter pieces to a dovetail guide can be seen. Two second indexing means 122 in the form of axial grooves can furthermore be seen at the inner diameter of the holding device 120.

FIG. 6 shows a holding device 120 of a fastening system 100 according to the invention in a three-dimensional illustration from a second perspective. By selecting different holding devices 120, in particular comprising different heights, different assembly situations can be responded to, wherein the customer-specific variance can be covered by means of the same ventilator 140 via different holding devices 120.

FIG. 7 shows a section from an embodiment of a fastening system 100 according to the invention in a three-dimensional illustration. As second fixing geometry 125, provision is made in this embodiment for a snap-fit at the holding device 120, which, in the assembled state of the holding device 120, snaps to the fastening device 110 downstream from the flange 119 of the fastening device 110, which acts as first fixing geometry 118 in this embodiment. In this embodiment, a screw 150 or a different additional part can thus be foregone for fixing the holding device 120 to the fastening device 110.

The embodiments shown herein only represent examples for the instant invention and must thus not be understood to be limiting. Alternative embodiments considered by the person of skill in the art are likewise comprised by the scope of protection of the instant invention.

LIST OF REFERENCE NUMERALS

-   -   100 fastening system     -   110 fastening device, wall ring     -   111 holding means     -   112 collar     -   113 first indexing means     -   115 first fastening geometry     -   116 second fastening geometry     -   117 first guide     -   118 first fixing geometry     -   119 flange     -   120 holding device     -   121 second guide     -   122 second indexing means     -   125 second fixing geometry     -   140 ventilator     -   150 screw 

1. A fastening system for fastening a wall ring axial ventilator comprising a wall ring as fastening device, a ventilator and a holding means, at a unit, wherein the fastening device is provided in radial direction around the ventilator and the ventilator is connected to the fastening device by means of the holding means, and wherein the fastening device encompasses a first fastening geometry characterized in that the fastening system comprises the fastening device and additionally encompasses a holding device, wherein the fastening device encompasses at least a second fastening geometry for fastening the holding device to the fastening device.
 2. The fastening system according to claim 1, characterized in that the second fastening geometry is provided at the circumference of the fastening device.
 3. The fastening system according to claim 2, characterized in that the fastening device encompasses a collar at its circumference, wherein the second fastening geometry is provided at the circumference of the collar.
 4. The fastening system according to claim 2, characterized in that the second fastening geometry encompasses a first guide, into which the holding device can be inserted, wherein the outer diameter of the first guide has maximally the same size as the maximum outer diameter of the fastening device.
 5. The fastening system according to claim 4, characterized in that the first guide is embodied as dovetail guide.
 6. The fastening system according to claim 5, characterized in that the dovetail guide encompasses a trapezoidal shape.
 7. The fastening system according to claim 5, characterized in that the dovetail guide encompasses a cylindrical shape.
 8. The fastening system according to claim 5, characterized in that the holding device encompasses at least a second guide, which can be operatively connected to the first guide of the second fastening geometry.
 9. The fastening system according to claim 8, characterized in that the first and second guide of the second fastening geometry and of the holding device encompass corresponding bevels in axial direction.
 10. The fastening system according to claim 1, characterized in that the fastening device encompasses at least a first indexing means, wherein the holding device encompasses a second indexing means, which interacts with the first indexing means in response to the assembly of holding device with the fastening device.
 11. The fastening system according to claim 10, characterized in that the first indexing means encompasses an axial projection at the outer geometry of the collar of the fastening device, while the second indexing means encompasses a groove, which runs in axial direction, at the inner diameter of the holding device.
 12. The fastening system according to claim 1, characterized in that the fastening device encompasses a first fixing geometry and the holding device encompasses a second fixing geometry, wherein the fixing geometries can be operatively connected in the assembled state.
 13. The fastening system according to claim 12, characterized in that the first fixing geometry is the first fastening geometry, wherein the second fixing geometry is a borehole of the holding device.
 14. The fastening system according to claim 12, characterized in that the fastening geometry encompasses a flange, which acts as first fixing geometry, and the second fixing geometry encompasses a snap-fit at the holding device. 